Kilojoules To Watt Seconds Conversion


1 kJ = 1,000 Ws

Want to convert from watt seconds to kilojoules instead?

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How to convert kilojoules to watt seconds (kJ to Ws)

The formula for converting kilojoules to watt seconds is: Ws = kJ × 1000. To calculate the kilojoule value in watt seconds first substitute the kilojoule value into the preceding formula, and then perform the calculation. If we wanted to calculate 1 kilojoule in watt seconds we follow these steps:

Ws = kJ × 1000

Ws = 1 × 1000

Ws = 1000

In other words, 1 kilojoule is equal to 1000 watt seconds.

Example Conversion

Let's take a look at an example. The step-by-step process to convert 2 kilojoules to watt seconds is:

  1. Understand the conversion formula: Ws = kJ × 1000
  2. Substitute the required value. In this case we substitute 2 for kJ so the formula becomes: Ws = 2 × 1000
  3. Calculate the result using the provided values. In our example the result is: 2 × 1000 = 2000 Ws

In summary, 2 kilojoules is equal to 2000 watt seconds.

Converting watt seconds to kilojoules

In order to convert the other way around i.e. watt seconds to kilojoules, you would use the following formula: kJ = Ws × 0.001. To convert watt seconds to kilojoules first substitute the watt second value into the above formula, and then execute the calculation. If we wanted to calculate 1 watt second in kilojoules we follow these steps:

kJ = Ws × 0.001

kJ = 1 × 0.001

kJ = 0.001

Or in other words, 1 watt second is equal to 0.001 kilojoules.

Conversion Unit Definitions

What is a Kilojoule?

A kilojoule (kJ) is a metric unit of energy in the International System of Units (SI). One kilojoule is equal to 1,000 joules. It is commonly used in nutrition and chemistry to express the energy content of foods and the energy released or absorbed in chemical reactions.
In the context of nutrition, kilojoules are often used to measure the energy value of foods and beverages. The energy we obtain from the food we eat is usually expressed in kilojoules or kilocalories (commonly referred to as calories). One kilocalorie is approximately equal to 4.184 kilojoules.
In chemical reactions, especially in the field of thermodynamics, energy changes are frequently measured in joules or kilojoules. The prefix "kilo-" denotes a factor of 1,000, so 1 kilojoule is equivalent to 1,000 joules.

What is a Watt Second?

A watt-second (Ws), also known as a joule (J), is a unit of energy in the International System of Units (SI). It represents one watt of power expended for one second. Mathematically, it can be defined as: 1 watt-second (Ws) = 1 watt (W) × 1second (s) = 1 joule (J).
Watt-seconds are used to measure the energy consumed or produced by electronic devices or electrical systems in a very short amount of time. For example, the energy released by a camera flash, the energy stored in capacitors, or the energy consumed by a small electronic circuit during its operation can be measured in watt-seconds.
In practical terms, a watt-second is a relatively small unit of energy. To provide some context, 1 watt-second is equivalent to the energy required to power a 1-watt device for 1 second.

Kilojoules To Watt Seconds Conversion Table

Below is a lookup table showing common kilojoules to watt seconds conversion values.

Kilojoule (kJ)Watt Second (Ws)
1 kJ1000 Ws
2 kJ2000 Ws
3 kJ3000 Ws
4 kJ4000 Ws
5 kJ5000 Ws
6 kJ6000 Ws
7 kJ7000 Ws
8 kJ8000 Ws
9 kJ9000 Ws
10 kJ10000 Ws
11 kJ11000 Ws
12 kJ12000 Ws
13 kJ13000 Ws

Other Common Kilojoule Conversions

Below is a table of common conversions from kilojoules to other energy units.

1 kilojoule in joules1000 J
1 kilojoule in megajoules0.001 MJ
1 kilojoule in gigajoules0.000001 GJ
1 kilojoule in calories238.8458966275 cal
1 kilojoule in kilocalories0.2388458966275 kcal
1 kilojoule in watt hours0.27777777777778 Wh
1 kilojoule in kilowatt hours0.00027777777777778 kWh
1 kilojoule in electron volts6241509074461000000000 eV